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3. 3. 평판디스플레이평판디스플레이
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3. 3. 평판디스플레이평판디스플레이(Flat Panel Display)(Flat Panel Display)
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Flat Panel Display (FPD)
• 평판 디스플레이(Flat Panel Display, FPD) : TV나 컴퓨터 모니터(브라운관을 이용)보다 두께가 얇고 가벼운영상표시장치를 뜻함.
• LCD (liquid crystal display), PDP (plasma display panel), OLED (organic light emitting diodes), FED (field emission display) 등이 있으며 LCD가 대세. LCD 주요 생산국은 한국과 일본.
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Electronic Display
CRT FPD Projection
Non-emissive Emissive
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LCD
PM AM
TFT
PDP OLED FED LED VFD 3D
PM AM
TN STN PDLC FLC
*VFD: vacuum fluorescence displayPM: passive matrixAM: active matrixTN: twisted nematicSTN: super TNPLDC: polymer dispersed liquid crystalFLC: ferroelectric liquid crystal
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Liquid Crystal Display (LCD)
• TFT LCD(Thin Film Transistor Liquid Crystal Display)는 두개의유리판 사이에 액정이 채워져 있는 디스플레이 방식.
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Plasma Display Panel (PDP)
• 픽셀 공간 내에 채워진 가스의 방전으로부터 방출된 자외선이 RGB 형광체와부딪쳐 가시 광선을 방출하는 원리로 화면을 구현.
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Plasma Display Panel (PDP)
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Field Emission Display (FED)
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Field Emission Display (FED)
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Field Emission Display (FED)
Key technologies
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Organic Light Emitting Diodes (OLED)
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Organic Light Emitting Diodes (OLED)
Electroluminescence process
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Organic Light Emitting Diodes (OLED)
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J. R. Sheats et al., Science 273, 884 (1996)
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Electronic Display
CRT FPD Projection
Non-emissive Emissive
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LCD
PM AM
TFT
PDP OLED FED LED VFD 3D
PM AM
TN STN PDLC FLC
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디스플레이 크 기 장 점 단 점• 저가격• 저소비전력• 고휘도• 고화질• 고해상도• 저소비전력 (4-8W)• 경량 / 박형• 대화면, 고화질• 구조가 간단
• 두께가 두꺼움• 무게가 무거움• 전자파• 시야각이 좁음• 응답속도가 느림• 저휘도, 고가격• 구조가 복잡• 고가격• 고소비전력
CRT
TFT-LCD
10-40”
< 40”
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• 구조가 간단• 빠른 응답속도• 시야각이 넓음• 박형• 대화면, 고화질• 구조가 간단• 시야각이 넓음• 저소비전력 (2-4W)• 고선명, 고속• 저소비전력• 경량 / 박형
• 고소비전력• 저효율
• 진공패키징 기술
• 소형크기• 저수명
PDP
FED
OLED < 20”
32-70”
< 30”
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디스플레이 현상(실용화단계) 장 래 성
• TV용의 주류• 대량생산
• 박형, 대화면TV용으로서 제품화 완료
• 저코스트로 고화질• 내구성이 높다• 얇게 만들수 없다는 결점이 있음• 장래성이 낮다
• 중소형을 중심으로 계속적으로 광범위한이용이 전망됨
• 브라운관보다 소비전력이 낮다
CRT
TFT-LCD
PDP
• Notebook PC,휴대전화 등의 주류
• 대량생산
• 대화면이며 박형기술로서 전시용 모니터나 대형TV용으로 보급이 전망됨• 소비전력이 크다는 결점이 있고, 생산코스트도 크다• 화소의 고정세화가 곤란
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으로서 제품화 완료PDP
FED
OLED • 일부의 휴대전화에서 제품화
• 試作단계
• 화소의 고정세화가 곤란
• 대화면이며 박형기술로서 장래기술이 확립되면 PDP를 대체할 가능성이 있음
• 소비전력은 브라운관보다 낮다• 고화질• 장래에 중소형에서도 가능성이 있음
• 휴대전화 등의 휴대용기기, TV용, PC용 등 광범위한이용이 전망됨
• 현상에서 소비전력은 CRT보다 낮고, LCD와 비슷한 정도• 고화질• 현재로서 내구성에 문제• 발광효율과 내구성이 높은 재료의 개발이 연구과제
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4. TFT LCD4. TFT LCD
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4. TFT LCD4. TFT LCD
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Liquid Crystal Display (LCD)
TFT-LCD
• TFT LCD(Thin Film Transistor Liquid Crystal Display)는 두개의유리판 사이에 액정이 채워져 있는 디스플레이 방식.
• 빛이 액정 분자 사이를 통과할 때, 액정 분자들의 배열에 따라빛의 방향이 조절되고, 편광 필터가 통과하는 빛의 방향을 조절.
• 전압이 인가되면 액정 분자들은 빛이 편광 필터를 직접 휘어진각도로 통과할 수 있도록 정렬 됨.
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각도로 통과할 수 있도록 정렬 됨. • 인가된 전압은 빛이 필터를 차단하거나 통과하게 하면서 액정이
마치 카메라의 셔터와 같이 움직이도록 함. • 비교적 적은 양의 전력과 유리를 사용하므로, TFT LCD는 비용부
담이 적고, 환경 친화적이며 유해 전자파를 방출하지 않는 모니터.
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Thin Film Transistor (TFT)
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Thin Film Transistor (TFT)
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Thin Film Transistor (TFT)
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구조구조
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컬러필터컬러필터
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컬러필터컬러필터
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